Alonzo hitchcock



@citen tatrs Beirut @frn ALONZO HITCHCOCK, or NEW YORK, N1. Y. Letters Patent No. 61,938, dated February l2, 1867 ante-dated January 30, 1867.

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TO ALL WHOM' IT MAY CONCERN:

Be it known that I, ALONZO HITCHCOCK, of the city of New York, in,the county, and State of New. York, have invented a certain new and. useful Improvement in Machine Gearing; and I do hereby declare that the following is a. full, clear, and exact description of thesame, reference being had to the accompanying drawing, making a part of this specification, and to the letters of reference marked thereon.

The object of my invcntion'is to distribute 'the application of `rotary power toa shaft in such away that there will be no tendency to displace the shaft from its bearings; and it consists in dividing the power, .and in applying it by means of an elastic belt and gearing on each side ofV the shaft to be driven so that the 4thrust on one side counterbalances that on the other. Y

To enable others skilled in the arts to which it appertains to make and use my invention, I will proceed to describe its construction and operation with reference to the drawing, in whichi Figure 1 is a side View; and

Figure 2,-a plan of gearing, arranged according to the said invention.

The shaft a, carrying, for instance, a circular saw, or connected with machinery, is the shaft that requires to be rotated. `It is'supported by journals working in bearings on the `frame in the usual manner, and is, furi nished with a friction-wheel, @that is driven at opposite points on its periphery by the corresponding frictionw-heels aand d. These wheels last mentioned are connected by abclt, e. Any application of power, therefore, to either oi' the shafts of the wheels c or d, rotates them' both in the same direction; and they each communicate to the opposite sides of the friction-wheel lying between their due share of power in opposite directions to produce the same rotary motion. With the driving-wheels rotating in the direction indicated by the arrows, the vwheel d tends todisplace the shaft a, by lifting it; but at the same time the power communicated by c also tends to depress it, and the one just counterbalances the other, so that thewhole power applied is utilized in producing the rotary-motion desired. The belt e, by which the power is distrlbutedbetween the driving-wheels, 'should be elastic to compensate for wear and inaccuracies of workmanship; and the bearings of the'driving-shaft should be allowed a` little play for the sare reason. There may be tbrec, four, or more driving-whccls placed i around `the central shaft, to divide and balancethe application ofthe power in a similar manner, but it is believed that two will be suiicicnt.`

I am aware that it hasA been hitherto essayed to carry shafts on rollers by which the friction has been converted into a rolling motion, and diminished in proportion to the diameters ofthe anti-friction wheels and their axles; but such an arrangement differs from my invention in the respect that I divide the power, and apply it on opposite sides of the shaft to be driven', so that there'is theoretically no friction of the shaft to be diminished, and the driving-wl1eelsV might as w-ell be cog-wheels as any other if they could be perfectly made and to work without noise.'

I claim as my invention- Distributing the power around the shaft to be driven, sc that the tendency to displace the shaft en one side is counteracted by that on the other by the means and in the manner substantially as described.

A. HITCHCOCK.'

Witnesses:

`THOMAS DAY, WM. KEMBLE HALL. 

